Arzawa letters

use in deciphering Hittite language

...made the first soundings and found the first cuneiform tablets there. The language in which those texts were written was not known at the time, but its identity with that of the so-called Arzawa letters found in Tell el-Amarna in Egypt was soon recognized. This led the Berlin Assyriologist Hugo Winckler to undertake excavations in 1906 together with Theodore Makridi (Bey) of the...

...not acknowledged as such at the time, the first step in the right direction was taken in 1902, when Assyriologist Jørgen Alexander Knudtzon pointed out that the language of the so-called Arzawa letters (e.g., Hittite), from the Amarna archive, had an apparent affinity with Indo-European.